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phosphate question

Discussion in 'Advanced Strategies and Fertilization' started by john b., May 21, 2005.

  1. john b.

    john b. Junior Poster

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    Tom, I read a post of yours on another forum which you said " inhibition of plant growth ranges for po4 are over 5ppm", does this mean over 5 ppm of po4 will affect growth or other nutrient uptake rates? If so , is this even if all other nutients are in proper range and how much over 5ppm would cause issues? Thanks,
    John
     
  2. Tom Barr

    Tom Barr Founder
    Staff Member Administrator

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    Re: phosphate question

    That means many folks have gone to 5ppm.
    We do not know if anything causes issues above that.
    Why would anyone want to add more than that?
    Even a bad dosing error would not get over that.

    Every once in awhile, someone thinks the KH2PO4 is KN03.
    So it does happen but a water change brings it right back down.
    Otherwise you have to add so much it starts to effect the KH buffering system(maybe 7-20ppm).

    We add plenty for the plants at 1-2ppm.
    There is a level that causes issues, but it's very high and impractical to find out critically since it likely effects the CO2/buffering system rather than merely PO4 inhibition impacting uptake.

    Regards,
    Tom Barr
     
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